For the final ā of any other root than those mentioned in ghumāsthāgāpājahātisāṃ hali [[6.4.66]], e may optionally be substituted in the Benedictive active, when the root begins with a conjunct consonant.,
The स्था was the only root of 6.4.66, which could have been affected by this rule. It has been, however, specially exempted by the word अन्यस्य ॥ Thus ग्लेयात् or ग्लायात्, म्लेयात् or म्लायात्, but only स्थेयात् 6.4.66, and यायात् (not commencing with a double consonant). The phrase क्ङिति is understood here and therefore the rule applies to Parasmaipada affixes 3.4.104. Thus ग्लासिष्ट in Atmanepada. The root considered as an anga, should consist of a double consonant, therefore in निर्वायात् (from निर् + वा), र्व is not to be considered as a root having a double consonant, for र is no part of the anga, but of the preposition.,